Locked Rooms — Laurie R. King

Mary Russell and husband Sherlock Holmes are en route to bustling San Francisco to settle her family's estate. But as they get closer to port, Mary falls prey to troubling dreams and irrational behavior. In 1906, when Mary was six, the city was devastated by an earthquake. For years, Mary has insisted she lived elsewhere at the time. But Holmes knows better.

It's clear that whatever unpleasantness Mary has forgotten, it hasn't forgotten her. A series of mysterious deaths leads Russell and Holmes from the winding streets of Chinatown to the unspoken secrets of a parent's marriage and the tragic "accident" that Mary alone survived. What Russell discovers is that even a forgotten past never dies...and it can kill again.